1357 results about "Test fixture" patented technology

The invention belongs to the technical field of semiconductor testing, and discloses a novel automatic detection system and method for the electrostatic protection performance of a power device. A distributed parasitic parameter network model is constructed by acquiring packaging structure parameters of a to-be-tested power device and physical layout data of a test fixture, key parasitic parameter distribution is identified in combination with a time domain reflection measurement technology, a waveform distortion coefficient is calculated, and a spatio-temporal evolution model of electrostatic pulse propagation is constructed. Based on the model, a compensatory predistortion waveform is generated to counteract the parasitic effect of a transmission path, a device port response signal is collected in real time, an energy dissipation characteristic spectrum is extracted through wavelet packet decomposition, and quantitative evaluation of the electrostatic protection performance is achieved. According to the invention, the test precision and repeatability are improved, and the method is suitable for electrostatic protection tests of various novel power devices, especially high-frequency wide-band gap devices.

The invention relates to an electrified vibration test clamp for a pin-containing surface-mounted integrated circuit, belonging to the technical field of integrated circuit test. Comprising a road board part and a structural member part, and the structural member part comprises a limiting base, a fixing buckle and a silica gel sheet for pressing the fixing buckle. The test circuit and peripheral elements thereof are arranged on one side of the circuit board, and the package of the device to be tested is independently arranged on the other side of the circuit board. The limiting base is used for being installed and fixed on a functional circuit board, a positioning groove for containing a device is formed in the limiting base, the position of a notch is just consistent with the packaging layout position of the device on the circuit board, and after the device is placed in the notch, pins can be matched with bonding pads in a one-to-one correspondence mode. The fixing buckle is installed and fixed on the notch of the limiting base for placing the device and reliably presses the pin of the device. The problems that the reliability of surface pressing type and pin locking type testing technologies is poor and a testing device is easily damaged during an electrified vibration test of an existing pin-mounted surface-mounted integrated circuit are solved. The device can be widely applied to electrified vibration and related environment tests of surface-mounted integrated circuits with pins.

The invention discloses a cable defect early warning method and device, terminal equipment and a storage medium, and belongs to the technical field of cable defect early warning, and the method comprises the steps: carrying out the frequency sweeping test of an equivalent circuit model, generating a reflection coefficient spectrum, separating a low-frequency component from the reflection coefficient spectrum, and taking the low-frequency component as a head-end reflection coefficient, through combination of the head end reflection coefficient, the internal resistance of the test equipment and the cable impedance, equivalent impedance at the joint of the test fixture and the head end of the cable is obtained through quantification, and an original reflection coefficient spectrum is corrected according to the equivalent impedance, so that impedance mismatch of the test fixture in the test process is eliminated. The corrected reflection coefficient spectrum can reflect the impedance of the cable body more accurately, so that the subsequently obtained time domain response can reflect the defect condition of the cable body more truly, and the accuracy of cable defect early warning is improved. The problem that the accuracy of cable defect early warning is low due to the fact that the original reflection coefficient spectrum cannot be corrected in the prior art can be solved.

The invention relates to a multi-path power supply parallel automatic test system and a test method. The multi-path power supply parallel automatic test system comprises a main control module, an instruction scheduling module, a test instrument group and a plurality of test fixtures, each test fixture is used as an independent test channel with self-defined configuration; a request signal input end of the main control module is connected with a request signal output end of the independent test channel, a test signal input end of the main control module is connected with a test signal output end of the test instrument group, and a control signal output end of the main control module is connected with a control signal input end of the instruction scheduling module; the signal output end of the instruction scheduling module is connected with the signal input end of the test instrument group, and the test instrument group is used for executing corresponding test operation on the to-be-tested power supply according to the control signal; the testing efficiency is remarkably improved, manual operation is reduced, and the basic capability of automatic parallel testing of multiple power supplies is achieved.

The utility model relates to the technical field of communication device detection, and discloses a test fixture of a communication device, which comprises a base, the upper surface of the base is respectively provided with a translation plate and a top frame, the upper surface of the translation plate is provided with a positioning template, the upper surface of the positioning template is provided with a positioning groove, and a circuit board is placed in the positioning groove. The surface of the top frame is provided with a clamping test assembly corresponding to the circuit board. According to the utility model, when the circuit board of the communication device is tested, the circuit board is adaptively arranged in the positioning groove on the surface of the positioning template, the hydraulic rod is controlled to extend to drive the lifting plate to move downwards, and the detection plate moves downwards synchronously to enable the test head to be in contact with the test pin to complete the detection action; the lifting plate moves downwards to drive the clamping frame to move downwards synchronously, the clamping frame abuts against the edge position of the circuit board, the clamping frame is driven by the elastic force of the supporting spring to clamp and fix the circuit board, additional clamping operation is not needed, and therefore the testing efficiency of the circuit board is improved.

The invention belongs to the technical field of integrated circuit testing, and particularly relates to a multi-station integrated circuit vibration testing device. Comprising a device body and further comprises a plurality of steel jackets, and the steel jackets used for installing testing clamps of different specifications are distributed on the four side faces and the upper surface of the device body respectively. The center of the upper surface of the device body is provided with the cylindrical groove cavity used for placing a sensor; and the locking screw holes are circumferentially distributed in the outer side of the cylindrical groove cavity, and the multiple locking screw holes penetrating to the lower surface are formed in the upper surface of the device body and used for locking and fixing the device body to a vibration table. According to the invention, a plurality of standardized steel sleeves are densely arranged on the side surface and the upper surface of the device body, so that the device can be simultaneously provided with a plurality of clamps with different specifications, thereby supporting the synchronous vibration test of integrated circuits with various packaging forms.

Systems and methods are directed toward low temperature testing of motion, vibration, or force responses of test fixtures. For cryogenic shock testing, a test object can be secured on a test apparatus, such as a test fixture of a shock table. An elongated enclosure, such as a flexible tube, can be connected between the test fixture and a laser vibrometer, positioned orthogonal to a surface normal at a test region of the test fixture to enable light emitted by the vibrometer to be reflected from the test region back to the vibrometer. A flow of purge gas can be introduced into the tube, proximate the test fixture, to direct moisture away from the test fixture. The flow can prevent condensation or ice from forming on the surface of the test fixture at the cryogenic temperature. A shock event can be simulated, and the response of the test region measured by the laser vibrometer. The impact of the shock event on the test object can then be observed.

The invention relates to the technical field of radio frequency cable testing, in particular to a method and device for improving cable intermodulation testing, and the method comprises the steps: pretreating a cable sample, cleaning a cable connector joint, and sleeving a welding part of a cable and a connector with a flexible protective sleeve; the test fixture is adapted, and the rotating shaft distance and the contact pressure of the dynamic test fixture are adjusted; carrying out multi-parameter collaborative testing, starting an intermodulation analyzer to load a test carrier, and collecting various data in real time; dynamic stress loading is carried out, a stepped vibration stress loading mode is adopted, and intermodulation value changes are monitored in real time; data storage and analysis: storing the data in the test process into a database to generate a test report; the device comprises a customized cleaning module, a test fixture module, a multi-parameter monitoring module, a welding part protection module and a control and data analysis module. The problem that an existing static test is separated from an actual working condition is solved, small-size cable test damage is avoided, and errors caused by manual operation are reduced.

The utility model belongs to the technical field of hot water equipment, and particularly discloses a testing tool which comprises an exhaust fume collecting hood, a flue gas sampling tube and a flue gas sensor, the exhaust fume collecting hood is provided with a fume inlet facing the combustor, and the exhaust fume collecting hood is provided with a plurality of installation structures. The flue gas sampling pipe is provided with a sampling hole, and the flue gas sampling pipe can be mounted on any mounting structure and conduct flue gas to the flue gas sensor; and when the smoke sampling pipe traverses the mounting structure, the sampling hole can traverse all fire holes of the combustor. According to the testing tool, by changing the position of the flue gas sampling pipe in the exhaust fume collecting hood, the flue gas values of the flue gas discharged from the fire holes at different positions in the combustor can be detected respectively, so that whether primary air or secondary air distribution of the combustor is reasonable or not is judged; and the improvement on the structures of the primary air hole and the secondary air hole of the gas water heater is facilitated.

The invention discloses an electronic device test fixture and a test system, and relates to the technical field of capacitance detection. The electronic device test fixture comprises a sample mounting unit and a test switching unit, the sample mounting unit comprises a test piece connecting part and a test signal interface, and the test switching unit comprises a signal input interface and a signal output interface. Wherein the test piece connecting parts are used for connecting electronic devices, the plurality of test piece connecting parts of the sample mounting unit are adapted to at least two electronic devices of different specifications, and a plurality of mutually independent conductive paths are formed between the test switching unit and the plurality of test piece connecting parts. And the test switching unit is used for transmitting a test electric signal received by the signal input interface to an electronic device loaded on the sample mounting unit. The test fixture can test the reliability of electronic devices of one or more specifications, and improves the test efficiency of the reliability of the electronic devices.

The invention discloses a test fixture and a test method suitable for various circuit boards, and the test fixture comprises a bottom plate, the top of which is provided with at least one first positioning groove; each fixing assembly comprises a fixing plate and a clamping groove structure, and the bottom of each fixing plate is provided with a fixing rib in sliding fit with the corresponding first positioning groove; the test probe assembly is detachably installed on the first set of fixing assemblies, the test probe assembly comprises a PCB, test probes and a probe pressure adjusting structure, the probe pressure adjusting structure comprises an elastic support installed on the PCB and a driving mechanism driving the elastic support to stretch out and draw back, and the multiple test probes are installed on the elastic support; and the electric connection assembly is detachably mounted on the second group of fixing assemblies. The test fixture provided by the invention can adapt to the test requirements of different types of circuit boards, the test pressure of the probe can be freely adjusted, the test fixture is simple and reliable in structure, and the fault rate and the maintenance cost are effectively reduced.

The invention discloses a test system and a test method. The test system comprises a control circuit, a detection circuit, a control unit, a feedback circuit, a test fixture structure, a test thimble and a placement table, a to-be-tested functional circuit board is placed on the placement table, the test fixture structure is used for fixing the to-be-tested functional circuit board, and the relative positions of test pins and test ejector pins of the to-be-tested functional circuit board are fixed; the control unit is connected with the control circuit, and the control unit is used for controlling the control circuit to be communicated with the burning ejector pin and the output end of an external burner in a power-on state and starting a burning action; the detection circuit is respectively connected with the function ejector pin of the test ejector pin and the control unit and is used for performing communication detection on the to-be-tested function circuit board after the control circuit stops acting; and the feedback circuit is connected with the control unit and is used for representing the detection result of the to-be-detected functional circuit board according to the detection signal provided by the control unit. The test efficiency of the functional circuit board is improved, and the complexity of the test process and the test cost are reduced.

The invention discloses a pressure sensor metering test fixture, and relates to the field of metering test, the metering test fixture is configured to be an automatic test fixture system used for realizing automatic feeding, clamping and multi-dimensional pressure test of a pressure sensor, and the automatic test fixture system comprises a fixing jig, a feeding mechanism, a grabbing manipulator and a test mechanism, the fixing jig is used for fixing a pressure sensor to be tested; the feeding mechanism is used for achieving jacking conveying of the fixing jig. The grabbing manipulator is used for grabbing the fixed jig from the jig bearing disc; the testing mechanism is used for executing automatic multi-step pressure calibration testing on the fixed to-be-tested pressure sensor; according to the measuring and testing clamp, the fixing jig, the feeding mechanism, the grabbing mechanical arm and the testing mechanism are integrated, integrated equipment integrating automatic feeding, precise clamping, multi-station testing and automatic circulation is constructed, and full-process automation and intellectualization of pressure sensor measuring and testing are achieved.

The invention discloses a testing device for a PCB (Printed Circuit Board). The testing device comprises a testing box body, a testing jig, a testing instrument and a control upper computer, a simulation battery module, a logic control module, an intermediate relay module, a reference BMS module and a power supply are arranged in the test box body; the simulation battery module outputs multiple paths of adjustable cell voltages for sampling of a PCB to be tested, the logic control module receives an instruction of an upper computer to control a test process, the intermediate relay module realizes signal switching and on-off control, the reference BMS module provides function parameter comparison, and the test instrument comprises an electronic load and a universal meter. The device is used for detecting parameters such as discharge performance, voltage and current. The test fixture is fixed and connected with a to-be-tested PCB, the contact port assembly can be replaced to adapt to different models, and the code scanning gun inputs test information and triggers a process. The device has the functions of multi-path voltage simulation, automatic signal switching and data acquisition and tracing, is modularized in structure and high in adaptability and expansibility, and can improve the batch detection efficiency and precision.

The invention provides a test auxiliary system and method, electronic equipment and a computer readable storage medium. The test auxiliary system comprises a linear movement module, an image acquisition module, a processing module and a test fixture, the image acquisition module is arranged on the linear moving module, the control end of the linear moving module is connected with the output end of the processing module, and the output end of the image acquisition module is connected with the input end of the processing module. The linear movement module is arranged to drive the image acquisition module to move, so that the movement control of the image acquisition module can be realized, and the position of the target test fixture where the target test object is located is determined, so that the image acquisition module can be moved to the positions of the fixtures in sequence; the barcode information of a plurality of target test objects can be quickly scanned, and the scanning efficiency of the barcode information is improved. And meanwhile, the problem of bar code input errors caused by manual work is avoided.

The utility model provides a drawing test tool, which belongs to the technical field of energy storage battery manufacturing and testing equipment.The drawing test tool comprises a test bench, a clamping assembly, a gantry support, a first locking assembly, a drawing test assembly and a second locking assembly, the clamping assembly is arranged on the test bench, the gantry support is arranged on the gantry support, and the second locking assembly is arranged on the gantry support. The object to be tested only needs to be clamped and positioned on the test rack through the clamping assembly, the gantry support is slidably arranged on the test rack in the first direction, and the drawing test assembly is slidably arranged on the gantry support in the second direction, so that the drawing test assembly can perform two-dimensional movement on the plane parallel to the test plane of the object to be tested; therefore, the drawing test assemblies can be moved to different test positions on the same surface of the to-be-tested object respectively without moving and adjusting the position of the to-be-tested object on the test bench or reloading the to-be-tested object, and the tensile mechanical properties of the to-be-tested object at different test positions can be tested quickly, accurately and efficiently.

The invention relates to a shearing performance testing jig and device.The shearing performance testing jig comprises at least one jig body, the jig body comprises a connecting part and a plurality of sample fixing parts, and the ends, away from the connecting part, of the sample fixing parts are provided with shearing faces; the shearing surfaces of the two opposite sample fixing parts of the two jig bodies used in cooperation are parallel to each other, the test included angles corresponding to at least part of the sample fixing parts are different, and the test included angles are the included angles between the planes where the shearing surfaces are located and the first direction. According to the shearing performance testing jig, the plurality of sample fixing parts are arranged in the jig body, each two opposite sample fixing parts fix one shearing sample, and the included angles between the planes where the shearing surfaces of at least part of the sample fixing parts are located and the stretching direction are different, so that the shearing performance of the plurality of shearing samples can be tested at a plurality of shearing angles; the influence of other variables except the shearing angle on the test result is reduced or avoided, the test accuracy is improved, and the test efficiency is improved.

The utility model discloses an alloy frame delivery reliability test fixture, including test table, the top of test table is opened with slide, both sides in the inside of slide are all slidably connected with movable frame. The utility model discloses adopt first servo motor drive positive and negative tooth screw rod rotation, can drive both sides movable frame in slide synchronous close or far away, realize the adjustment of horizontal interval, simultaneously, second servo motor drives gear and tooth engagement, can make movable post drive the clamping block in the groove before and after sliding, complete the adjustment of longitudinal position. This two -way adjustment mode lets the clamping block accurate adhesion different size alloy frame, need not to replace the fixture, and the flexibility and efficiency of test have been improved greatly greatly, and the stable reliable of adjustment process is ensured to the double -drive, effectively avoid the test error because of the specification incompatibility, and the device has the advantage of being applicable to different specifications alloy frame and positioning accurate.

The present application relates to a device for testing electrical performance parameters of bipolar transistors, comprising a test fixture for operatively mechanically and electrically coupling a bipolar transistor to be tested, a test circuit for applying a test input signal to the transistor under test, a measurement circuit for measuring an output signal of the transistor and determining electrical performance parameters thereof, and a controller for automating the testing process and analyzing the measurement data, wherein the test fixture has fluid cavities formed through its length by one or more flow holes, and at least one cooling section in the form of a uniform or non-uniform spiral is arranged in each fluid cavity to extend along the corresponding fluid cavity. The test circuit comprises a signal generator for generating the input signal and a power supply for providing necessary bias voltages to the transistor; the measurement circuit comprises an oscilloscope for measuring the output signal and a computer for processing the measurement data; the controller is capable of automatically acquiring and analyzing the measurement data of the transistor to determine the electrical performance parameters.

This utility model discloses a multi-station testing fixture for radio frequency modules, belonging to the field of testing fixture technology. It includes a base with several bolts threaded through it. A mounting shell is fixedly installed on the upper surface of the base, and a motor is fixedly installed inside the mounting shell. A rotating shaft is fixedly installed at the end of the motor's output shaft, and a sliding sleeve is slidably provided on the outer surface of the rotating shaft. By using the motor in conjunction with the rotating shaft, a rotating disk, and multiple workstation plates on the rotating disk, the motor drives the rotating shaft to rotate the rotating disk, thereby realizing the switching and adjustment of multiple workstation plates, thus achieving multi-station testing. After testing one product, only the position needs to be switched, ensuring good testing efficiency. Furthermore, the bidirectional screws on the workstation plates, in conjunction with the workstation clamps, securely clamp the radio frequency module, ensuring that the radio frequency module will not shake or shift during testing, and guaranteeing smooth and accurate testing.

The invention provides a test fixture for a photoelectric microsystem. The test fixture comprises a test seat and a test plate, the test seat comprises a cooling device, an adapter plate, a needle frame and a heat sink; the cooling device is fixed to the heat sink and used for cooling the heat sink. The heat sink provides downward pressing force, so that the elastic contact of the photoelectric microsystem is connected to the adapter plate, and meanwhile, the adapter plate is pressed on the pin frame; the needle frame is made of metal and is used as a ground network; the signal pins are fixed on the pin frame through the dielectric ring to form signal point locations; the power needles are fixed on the needle frame through the medium rings to form power source point positions; the power needle is directly fixed on the needle frame to form a site; the signal pin and the power pin are connected with the test board; by adjusting the installed signal pin and the power pin, the photoelectric micro-system test with different pin definitions can be adapted.

The utility model discloses a test fixture, which comprises a base, a radio frequency microstrip line and a radio frequency connector, and is characterized in that the base is provided with a first groove, the first groove is provided with a first installation area for installing a bare chip and a second installation area, and the second installation area is arranged around the first installation area; the radio frequency microstrip line is arranged in the second mounting area, and the radio frequency microstrip line is connected with the bare chip by arranging a gold bonding wire; the radio frequency connector corresponds to the radio frequency microstrip line and penetrates through the base, and the radio frequency microstrip line is connected with the radio frequency connector. The method and the device have the advantages that the method and the device are applicable to bare chips of different types and sizes, the performance of the chips can be quickly tested, the universality and the operability are high, the design time and the processing cost are saved, and the test efficiency is greatly improved.

The present application relates to a kind of composite material blade tenon sampling piece tensile test fixture and test method.The tensile test fixture is used to clamp the two ends of tenon sampling piece and carry out tensile test, specifically includes ear piece adapter, mortise simulation piece, pin, a pair of clamping plate and several clamping plate bolts.The upper end of ear piece adapter is connected with the upper clamp of testing machine, and the lower end of mortise simulation piece is connected with the lower clamp of testing machine.The lower end of ear piece adapter is connected with the upper end of two clamping plates by pin penetration, and pin shaft connection pair is formed.Two clamping plates are oppositely arranged and clamp tenon sampling piece by clamping plate bolt in array compression mode.The inner side of clamping plate and tenon sampling piece contact is provided with tooth groove structure, and the inner cavity profile of mortise simulation piece is adapted to the shape of the outer surface of tenus sampling piece.Compared with prior art, the present application is suitable for static strength test under 0~250 kN large load range, and significantly improves the stability and success rate of composite material special-shaped sampling piece test.

The utility model discloses a kind of module test fixture increase FPC fixed block structure, including workbench one, the product placement groove one is equipped in workbench one middle part, the workbench one front end is equipped with workbench two, the workbench two is equipped with recess, the recess is equipped with product placement groove two, the left and right sides of product placement groove two are equipped with limit slot, the recess front side is equipped with two connecting holes one, the recess outer left and right sides each is equipped with one connecting hole two, the utility model can be with good fixed product, and can prevent misplacement, improve work efficiency.

The utility model relates to test fixture technical field, especially a solid state disk test fixture, including the bottom plate of horizontal setting, the top surface fixedly connected with frame of bottom plate, the top of frame is connected with the U type frame of sliding, the left and right sides of U type frame all are connected with two symmetrical settings locking bolt of rotation. The utility model's advantage lies in: this solid state disk test fixture drives the rotation of driving rod through motor, drives the cam to push the upward movement of lifting plate, makes the jackscrew steady and lifts the hard disk body. Spring provides the buffer force in the process of jacking, ensures that the separation process of hard disk body and test socket is even. This automatic ejection mechanism completely avoids the wear and tear problem of golden finger caused by uneven force when pulling out manually, and the accurate guidance of the jackscrew through the through hole makes the hard disk body keep vertical rising, protects the contact surface integrity of golden finger and test socket, and significantly improves the reliability and durability of test and plug.

The utility model discloses a lithium battery diaphragm crosslinking degree test fixture, including container, connecting pipe and screen mesh, the container has the accommodation cavity, connecting pipe is provided in the accommodation cavity, the connecting pipe is provided with the through hole, the through hole can be used for the test liquid in the accommodation cavity to enter the connecting pipe, the outer surface of container is provided with at least one opening, the opening is communicated with one end of the connecting pipe, and the other end of the connecting pipe is communicated with the screen mesh. The screen is used for wrapping a sample to be tested, the screen can be placed into the connecting pipe from the opening, and the screen is in close fit connection with the connecting pipe, so that the screen and the sample to be tested can be prevented from floating upwards by means of close fit connection of the screen and the connecting pipe, and the test result is more accurate.

The utility model discloses a kind of touch type circuit board test fixture, including workbench, vertical support, limit board, detection support, detection assembly, sliding column, V-shaped support, L-shaped driving arm, linkage rod and driving column, the workbench end surface is equipped with limit board and vertical support, the vertical support top center is equipped with V-shaped support, the V-shaped support bottom extension limb is slidably connected with driving column, the driving column sliding path is perpendicular to workbench plane, the V-shaped support top extension limb and L-shaped driving arm short limb outer end are hinged, the L-shaped driving arm right-angle part and linkage rod one end are hinged, the linkage rod other end and driving column top end are hinged, the driving column bottom end is equipped with detection support, the sliding column is vertically arranged in vertical support, multiple detection assemblies are equipped with in the detection support, the limit groove for placing circuit board is in limit board end surface, circuit board can be batch detected in detection process, to improve overall detection efficiency.

The invention provides an FC network switch simplified test method, which relates to the technical field of aviation systems, and comprises the following steps: S1, constructing a test environment, inserting a first FC switch and a second FC switch into a test tool, and interconnecting a plurality of ports of the first FC switch and the second FC switch; s2, controlling the first FC switch and the second FC switch to start and operate in a ground working mode through an external discrete magnitude, and setting domain IDs of the two switches to be 1; and S3, controlling the CPUs of the first FC switch and the second FC switch to inject an FC excitation source through software, so that the first FC switch and the second FC switch mutually send and receive FC test messages through interconnected ports to execute an automatic test. According to the method, the problem of test environment conflict frequently existing in actual scientific research test and experimental test is solved, the progress of production delivery, scientific research and troubleshooting is accelerated, and a reference basis is provided for development and test of similar products.

This application provides an FPCA testing fixture, relating to the field of FPCA testing technology. It includes an upper mold and a lower mold, with the upper mold positioned above the lower mold. A mounting plate is provided on the lower mold, and the mounting plate has a product slot for placing FPCA. A first needle plate is movably disposed below the mounting plate, and a first probe is mounted on the first needle plate. The upper end of the first probe extends into the product slot. A booster seat is disposed below the first needle plate, and the booster seat is externally connected to a booster cylinder. This fixture independently pushes the first probe using a dedicated external booster cylinder, increasing the first probe's stroke and ensuring that the first probe can effectively pierce the rosin layer, improving test yield, reducing unnecessary rework or scrap, and increasing production efficiency.

The invention relates to the technical field of drilling and production equipment testing tools, in particular to a drill rod bidirectional clamping high-temperature testing clamp which comprises a shell, an outer wall clamping mechanism and an inner wall clamping mechanism, and the outer wall clamping mechanism and the inner wall clamping mechanism are arranged in the shell. The outer wall clamping mechanism comprises a contraction elastic clamping sleeve and a first driving device in driving connection with the contraction elastic clamping sleeve, and the inner wall clamping mechanism comprises an expansion elastic clamping sleeve and a second driving device in driving connection with the expansion elastic clamping sleeve. The contraction elastic clamping sleeve and the expansion elastic clamping sleeve are coaxially arranged in a spaced mode, and a clamping channel used for clamping the end of the drill rod is formed between the inner wall of the contraction elastic clamping sleeve and the outer wall of the expansion elastic clamping sleeve. The first driving device can drive the contraction elastic clamping sleeve to contract in the radial direction of the clamping channel, and the contraction elastic clamping sleeve expands and resets in the radial direction of the clamping channel after being undriven; the second driving device can drive the expansion elastic clamping sleeve to expand in the radial direction of the clamping channel, and the expansion elastic clamping sleeve shrinks and resets in the radial direction of the clamping channel after being undriven.